Violaine Coulon
Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment
Coulon, Violaine; Bulthuis, Kevin; Whitehouse, Pippa L.; Sun, Sainan; Haubner, Konstanze; Zipf, Lars; Pattyn, Frank
Authors
Kevin Bulthuis
Philippa Whitehouse pippa.whitehouse@durham.ac.uk
Honorary Professor
Sainan Sun
Konstanze Haubner
Lars Zipf
Frank Pattyn
Abstract
The Antarctic ice sheet (AIS) lies on a solid Earth that displays large spatial variations in rheological properties, with a thin lithosphere and low-viscosity upper mantle (weak Earth structure) beneath West Antarctica and an opposing structure beneath East Antarctica. This contrast is known to have a significant impact on the ice-sheet grounding-line stability. Here, we embed within an ice-sheet model a modified glacial-isostatic Elastic Lithosphere-Relaxing Asthenosphere model that considers a dual pattern for the Earth structure beneath West and East Antarctica supplemented with an approximation of gravitationally consistent geoid changes, allowing to approximate near-field relative sea-level changes. We show that this elementary GIA model captures the essence of global Self-Gravitating Viscoelastic solid-Earth Models (SGVEMs) and compares well with both SGVEM outputs and geodetic observations, allowing to capture the essential features and processes influencing Antarctic grounding-line stability in a computationally efficient way. In this framework, we perform a probabilistic assessment of the impact of uncertainties in solid-Earth rheological properties on the response of the AIS to future warming. Results show that on multicentennial-to-millennial timescales, spatial variability in solid-Earth deformation plays a significant role in promoting the stability of the West Antarctic ice sheet (WAIS). However, WAIS collapse cannot be prevented under high-emissions climate scenarios. On longer timescales and for unmitigated climate scenarios, continent-wide mass loss projections may be underestimated because spatially uniform Earth models, as typically considered in numerical ice sheet models, will overestimate the stabilizing effect of GIA across East Antarctica, which is characterized by thick lithosphere and high upper-mantle viscosity.
Citation
Coulon, V., Bulthuis, K., Whitehouse, P. L., Sun, S., Haubner, K., Zipf, L., & Pattyn, F. (2021). Contrasting Response of West and East Antarctic Ice Sheets to Glacial Isostatic Adjustment. Journal of Geophysical Research: Earth Surface, 126(7), Article e2020JF006003. https://doi.org/10.1029/2020jf006003
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 1, 2021 |
Online Publication Date | Jun 18, 2021 |
Publication Date | Jul 9, 2021 |
Deposit Date | Aug 17, 2021 |
Publicly Available Date | Aug 18, 2021 |
Journal | Journal of geophysical research. Earth surface. |
Print ISSN | 2169-9011 |
Electronic ISSN | 2169-9011 |
Publisher | American Geophysical Union |
Peer Reviewed | Peer Reviewed |
Volume | 126 |
Issue | 7 |
Article Number | e2020JF006003 |
DOI | https://doi.org/10.1029/2020jf006003 |
Public URL | https://durham-repository.worktribe.com/output/1242751 |
Files
Published Journal Article
(4 Mb)
PDF
Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
© 2021. The Authors.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
You might also like
GEORGIA: A Graph Neural Network Based EmulatOR for Glacial Isostatic Adjustment
(2023)
Journal Article
Antarctic ice sheet paleo-constraint database
(2023)
Journal Article
Mass balance of the Greenland and Antarctic ice sheets from 1992 to 2020
(2023)
Journal Article
An ensemble of Antarctic deglacial simulations constrained by geological observations
(2022)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search